Dental plugger



(No Model.)

F. ABBOTT.

DENTAL PLUGGBR.

.NO- 368,179 Patented Aug. 16, 1887.

WITN ESS ES Unirse STATES ArtNr Ottica.

w FRANK ABBOTT, OF N EV YORK, N. Y., ASSIGNOR TO THE SFS. VHITE DENTALMANUFACTURING COB'PANY, OF FHTLADELPHTA, PENNSYLVANIA.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters 'Patent No. 368,179, dated August16, 1887.

Application filed Maru-h 21, 1837. Serial No. 231,746. (No model.)

To @ZZ whom it may concern: mer-raising tripping-lever carried by saidBe it known that 1, FRANK ABBOTT, a citi spindle and also the positionof the partsjust zen of the United States, residing at New York, afterthe lifting-lever has been tripped andthe in the county of New York andState of New hammer thrown forward. to strike the blow- 5 York, haveinvented certain new and useful receiving surface or end of saidspindlecol- 55 Improvements in Dental Plug-gers; and I do lar. Fig. 5 isa view of a portion of the inhereby declare the following to be a full,clear, strument, showing more particularly thc front f and exactdescription of the invention, such section of the casing and thetripping-case, as will enable others skilled in the art to which theblow-receiving collar and the spindle be1ng 1o it appertains to make anduse the same. drawn back, and the front end of the handle 6c Myinvention relates to improvements in or middle section of the casingbeing-shown dental pluggcrs of the typo known as handdetached and insection. Fig. (i is a view of pluggers, (as distinguished from enginethetripping case detached, showing more driven pluggers,) in which theblows of the particularly its slotted side to accommodate I5 slidinghammer are communicated to the plugmovements of the tri pping-leverrocking there- 65 ger-point by means of a spring operated by in. Fig. 7is a view of the end of said tripthe pressure of the plngger-point uponthe ping-case, showing slots or recesses therein to iilling which is toreceive the blow and which receive the projecting ends of a pin which isto be impacted or condensed in the cavity pivots the trippinglever inthe spindle, and

2o of the tooth. which passes through the blow-receiving col- 70 Theobject of my invention is to improve lar, said pin ends tting said slotsor recesses hand-pluggers by simplifying their construcof thetripping-case to prevent the spindle tion and improving` theeffectiveness of their from turning. Fig. S is a view in elevation ofoperating organism. the incased hammer impelling or striking 25 To thisend my invention consists of certain spring. Fig. t) is a View of themain portion 75 novel organizations of parts and combination of the rearcasing-section, and Fig. l0 is a of devices which will first bedescribed, with view of the minor or other portion of said the aid ofthe accompanying drawings, in derear casing section, showing` itsconnection tail, as embodied in the best way now known with a male-screwtube, which reciprocates a 3o to me, and then particularly recited inthe female-screw tube or nut to control the power So claims at the closeof this specilication. of the hammer or striking' spring to regulate Insaid drawings, Figure 1 is a view in elethe blow to be struck. Fig. l1is a perspectvation of the improved plugger about the ive View of theretaining-plate coupling the usual size of such instruments. Fig. 2 is atwo portions of the rear casing-section tof 3 5 longitudinal sectiontheretlnough,enlarged for gether, with the capacity of the minor or end8 5 the sake of clearer illustration, and showing portion to turnrelativelv to the other portion the parts in their normal position or atrest. in regulating the power of the impelling or Fig. 3 is a view ofthe front end of the interstriking spring. nal parts ofthe instrument,partly in section, The casing of the instrument is preferably 4o andshowing the parts in the position they octubular and' made in three mainsections, a 9o cupy in operating, with the hammer raised front section,A, a main or handle section, A, and j ust prior to being tripped todeliver its and a rear section, A2 A3. The front section blow upon theplugger-point or tool-holder. is or may be roughened, as at a, to afforda Fig. L.tis a view substantially similar to that of better grasp forthe fingers of the operator,

\ 45 Fig. 3, with the sliding hammer and tripping and is screw-threaded,so as to screw into the 95 portion of the instrument shown in dottedfront interiially-threadcd end of the main scclines. This view showsmore clearly the blowtion A. The front cud of the rear section, A2receiving collar and its hard-rubber or equiv- A3, is likewise threadedto screw into the rear aient facing of the tool-carrying shaft orspininternally-threaded end of said main section 5o dle and the springwhich acts npon the ham A. Said rear section is made up of two porroo 2'Scalve tions, A2 A3, the portion A3 fitting in the portion A2 by meansof a front sleeve, A4, forming part of the portion A, and said portionA3 having an annular, groove, a', to receive the bent end a2 of a plate,A5, fastened on said portion A2, with its bent end a2 passing through aslot, a3, into said groove c. By this couplingof the portions A2 A3together the portion A3 swivels or turns on the portion A2, so as torevolve the sleeve A4 for a purpose which will hereinafter appear.

A central spindle, B, passes through the casing from end to end, and its'ends are screwthreaded to receive the threaded ends of the tools orplugger-points b, one for each end of the instrument, as is common, sothat thrust and pull blows can be delivered and all character offillings reached. Separate views of the tools are also shown in Fig. l,and they may of course be secured in the tool-holding spindle in otherways than by the screwthread'ed ends.

The hammer C is fitted to the spindle B so as to be guided and slidefreely thereon without frictional contact at its periphery. This.

permits easy action. The bore of the hammer is preferably of smallerdiameter at its ends than between them, so as to fit the hammer to slideon the spindle by end bearings,c c. This reduces the friction to aminimum. The hainmer C is thrown forward by an impelling or strikingspring, D, when the hammer is moved back to compress said spring, and isthen released or tripped in the usual way. This spring, however, ispeculiar. It has no frictional bearing at its outer side against theinterior of the casing, which is objectionable. On the contrary, it isfitted with a coveringsuch as leather-havingvfrictional contact with thecasing and in which the spring may be compressed and expand in action.This covering has another function. It prevents noise from the spring,stopping vibration and making the action of the spring noiseless. Thefront end of' said striking spring D bears against the rear end of thehammer and its rear end against the front end of an adjusting nut orthimble, E. This adjusting-nut is internally threaded, and works on malethreads of the sleeve A4 of the swiveling portion A2 of the rearcasing-section. The nut is held from turning by the front bent end a4 ofthe plate A5, which passes through a hole, a, in the casing-section A2A3 into a longitudinal slot, e, of said nut E.

Obviously, upon turning the sleeve A4 of the swiveling portion A3 of therear section of the casing, the nut E may be moved back and forth toregulate the tension or force of the strikingspring D, and consequentlythe force of the blows administered by the hammer C to the pluggingpoint or tool.

yThe front end of the hammer is the striking end,V and normally restsupon an annular shoulder formed by the rear end of a sleeve, F, which Iterm the tripping-case.77 (See Fig.

2.) This tripping-case is confined between a shoulder, ai, of the maincasing-section A and a shoulder or shoulders of the front casingsection,Amas, for instance, at as and cl2- and is locked from turning by a lugor pin, f, which enters a slot, f', in the casing-section A. (See Figs.2 and 5.) The spindle B passes through this tripping-case F, auditsfront end f2 is much reduced, so as to permit the rear end of thecase-raising spring G to be fitted thereon and bear against thetripping-case as a shoulder. The front end of said case-raising springbears against a shoulder formed by a collar, H, pinned to the spindle B,the rear reduced end, h, of said collar II forming a sleeve, and

the space between the rear end ofsaid sleeve and the front end of thetripping-case defines and limits the range of endwise movement of thecasing of the instrument on the central spindle.

The case-raisin g spring G, like the hammerspring D, is fitted Vwith acover, g-such asr leather-and for the same purposes.

llithin the tripping-case F the spindle B is slotted, as at b', forexample, to receive a rocking hammer raising and tripping lever orlatch, I, pivoted by means of athroughfpin, z.

Thecnds of said pin also pass through ablowreceiving collar, J, so as tounite said collar firmly to the spindle B. This blow-receiving collar isfitted to work or slidein the enlarged bore of the rear endof thetripping-case F. .One side of said tripping-case `is slotted to permitof the passage of the tripping-lever I, and enable its tail end to rockor vibrate therein.

A spring, i', acts on the tail end of the tr1pping-leverV I, with atendency to throw the rear or hammer end, i12, of said lever crosswiseof the slot in the spindle in which it is pivoted.-

The lever I is peculiar. It has a curved end, i2, the center of thecurve being the axis` of the lever. The end of the hammer, against whichthis curved end of the lever acts, is correspondingly curved, so thatthe rocking of the lever on its pivot merely causes its end to rub overthe curved surface of the hami mer end without, by the rocking of thelever. per sc, causing any elevation of the hammer, as a square or flatsurface would do. This lessens friction and conduces to regular smoothaction. The tail end of the tripping-lever has a curved or cam surface,2, to work against a cam-surface, f2, of the tripping-case F.

The operation of the instrument is as follows: The normal position ofthe parts is as represented in Fig. 2. Now'place the point of theplugging-tool on the filling to be compacted. Press on the casing, orpush or pull, according to which end .of the instrument is used. Thiscauses .the casing to slide on the spindle, and as the end of the hammerraising and tripping lever is in contact with the ham mer forces thehammerto slide on the spindle andl compress its impelling-spring. As thepressure continues the cam-surface on the tail end of the lever beginsto work on the camsurface of the tripping-case, and it is rocked inward,so as to carry both ends of said lever within its slot in the spindle,and of course its hammer end out of lifting contact with the hammer. Atthe end of the necessary movement the lever is entirely withdrawn fromcontact with the hammer, or is tripped and released, and at this momentthe striking-spring, with its accumulated power, impels the haar merquickly against the blow-receiving sur face of the collar J, whichduring` the movement of the casing on the spindle has been protruded orexposed, as in Figs. 3 and 4, beyond the end of the tripping-case. Theblows are thus received on the collar J and communicated to the tool orpoint through the spindle B.

The blow-receiving collar is preferably provided with a hard-rubbercollar, J to deaden the sound of the blows administered by the hammer.

The advantages of my instrument are simplicity of construction and easyeffective operation.

I claim as my invention-m l. The combination ofthe casing, the hammer,the striking-springof the hammer, the slotted adjusting-nut of saidspring, the swivcling portion of the easing having an annular groove,and the interlocking connection of the casing fitting said slotted nutand annular groove, substantially as described.

2. The combination of the easing, an inclosed expanding` and contractingspring, and a souml-destroying cover for said spring between it and saidcasing, substantially as described.

3. The combination, in a dental pluggen of detachable casing-sectionsfitted with an internal detachable tripping-case conincd betweenshoulders of said detachable casing-sections, substantially asdescribed.

4. The combination of the annular trippingcase, the spindle, the hammerfitted to slide on said spindle, and the pivoted hammer raising andtripping lever, substantially as described.

5. The combination of thc casing, the slotted spindle, the hammer, thetripping-lever pivoted in the slot of said spindle, and a camsurface insaid casing to rock said lever to release the hammer, substantially asdescribed.

6. The combination, with the hammer having a curved seat on its strikingend, of a hammer raising and tripping lever having a curved lifting endto fit said curved end ofthe hammer, substantially as described.

In testimony whereofI affix my signature in presence of two witnesses.

FRANK ABBOTT.

Vitnesses:

ELI T. STARR, FRANK Ano'r'r, J r.

